The current version has three control leds build right in the power distribution/Launchpad box. When the system is on both leds on the right should be lit. If this is not the case the system will definitely not work. In this case the first thing you should check if the PSU is properly connected. When an authorized phone call is being received the red led on the left will blink.

The current version has three control leds build right in the power distribution/Launchpad box. When the system is on both leds on the right should be lit. If this is not the case the system will definitely not work. In this case the first thing you should check if the PSU is properly connected. When an authorized phone call is being received the red led on the left will blink.

Why

The lease of the space gives us three remotes to open the gate. We're coming up to 20 members now. So we decided to take one remote, mount it in reach of the gate and hook it up to a computer with a huawei modem.
The idea is: you call the number of the modem, it checks the caller id against a text file, and if it's in there it switches the remote. Best of all: 'just letting it ring one time' doesn't cost money and opens the door.
It's democratic because all our members have a cellphone, not all have a smartphone.

Next plans

System architecture

A computer running the Gatekeeper software (currently the Audio server) and connected to a Huawei modem and a Launchpad in a Terminal server case.

An old ATX PSU and a junction board containing a TI Launchpad board.

A plastic IP65 junction box to be placed in front of the gate.

A cat5 UTP cable will connect the front junction box with the one in the space.

Circuit

The current circuit is a PNP transistor that, when base goes high (+5V), connects the Terminal PSU to a relais in the junction box that turns on the remotes (as if it's buttons were pushed). Since we migrated from the beagle board to the Launchpad only the right half, From the 1K resistor on, of the diagram is used.

Hardware

Lantronix case (obsolete)

Power supply

The original Lantronix PSU can be reused.
It gives the following outputs on a 6-pin molex:

Pin Number

Color

Voltage

1

RED

+12

2 & 3

BLUE

+5

4 & 5

BLACK

Ground

6

YELLOW

-5

TI Launchpad

Pinout on the Launchpad towards the gate opener:

Pin 1.7: white: 5V on/off (when high, remote gets "pushed")

Pin GND: black: ground (required to make sure we have a stable ground shared between the usb-computer connection and the terminal server PSU)

Stripboards

The two print boards, from RIGHT to LEFT: power connected to the inverter - now modified to act as passthrough (this pic is old), connected to the relais steering, connected to the ethernet cable (unclear).

RJ45 output connector to the IP65 case

one pair carrying power to the remote (+12 Volt continuous plus ground)

we are using the blue pair for this

one pair carrying the signal to the relais (+5 Volt if on, plus ground)

we are using the brown pair for this

the +5V comes from the PSU, but the beagle bord does the switching through pin 9 on 1.8v

Local junction box

Power supply

An old ATX PSU was used. One of the 4 pin connector was replaced with a 3 pin version to server our purpose.

Pin Number

Color

Voltage

1

BLACK

Ground

2

YELLOW

+12V DC

3

RED

+5V DC

Build in control leds LED

The current version has three control leds build right in the power distribution/Launchpad box. When the system is on both leds on the right should be lit. If this is not the case the system will definitely not work. In this case the first thing you should check if the PSU is properly connected. When an authorized phone call is being received the red led on the left will blink.

Control LEDs

location

color

function

status

Right bottom

Blue

12V line is active

Always on

Right top

Green

5V line is active

Always on

Left bottom

Red

The signal to open the gate is being send

On intermittently when an authorized phone call is being received

Other

Door opener tester

Old version (lost)

Simply a RJ45 male plug with a led attached to the brown pair. To be inserted into the connection of the remote. Allows developing software and hardware and testing the door without actually making the door go open. When the led is on, the remote is pressed.

New version

Similar to the previous version this can be used for software testing. In addition to the first version is will also show if both supply voltages are OK. Bottom right clear red led indicates if 5V DC is OK, the bottom left clear led is for the 12V DC, The top regular red led is only lit when the signal is being send. (A income call is received.)

IP65 Junction box

Remote

Stripboard

The stripboard contains the following:

Two RJ45 connectors

RJ45 connector on the bottom (IN) to receive power & signal

Relais

Remote

Double line male pins, with female connector connected to in ethernet cable